The thorny cross-border case lands before the Supreme Court with bilateral tensions running high over President Donald Trump's call for a border wall to keep out Mexican migrants.
At issue before the eight black-robed justices is whether the family of 15-year-old Sergio Hernandez Guereca has the constitutional right to sue the agent who killed him in American courts.
And on that question, the court -- which is evenly split between conservatives and liberals pending confirmation of President Donald Trump's nominee Neil Gorsuch -- appeared firmly divided.
The youths were racing up the concrete embankment to touch the barbed-wire fence on the US side of the border, and racing back down, when Hernandez was shot in the head by border patrol agent Jesus Mesa.
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Mesa later recounted that Hernandez and his friends had refused to obey his order to stop the game and had thrown rocks at him. According to the teen's family, he was unarmed and presented no danger.
Speaking to AFP at her small home in Ciudad Juarez, the boy's mother Guadalupe Guereca said she wants just one thing: "Justice."
"I am fighting for my son but also for other people who have suffered in similar cases," said the 59-year-old.
According to the family's lawyers, US border patrol agents have fatally shot at least eight Mexicans between 2006 and 2016 in cross-border incidents.
The US federal government is backing Mesa, concerned that allowing Hernandez's relatives to sue could unleash a torrent of lawsuits over actions taken by Americans outside the country.
Representing the family on Tuesday, attorney Bob Hilliard argued that "this tragic case is one of the simplest extraterritorial cases this Court will ever have in front of it for five reasons.
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